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检索条件"机构=1. State Key Laboratory of Multiphase Flow in Power Engineering"

共 1597 条记录，以下是381-390 订阅

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Experimental study of auto-ignition of dimethyl ether at low-temperatures and low-pressures 12

Experimental study of auto-ignition of dimethyl ether at low...

引用

1.th Asia-Pacific Conference on Combustion, ASPACC 201.

作者： Huang, Wenlin Sun, Wuchuan Wu, Honghuan Qin, Xiaokang Jiang, Xue Zhang, Yingjia Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

Dimethyl ether (DME) is a property of alternative fuels to attract due to the special molecular structure in terms of either scientific study or engine application. However, the lack of fundamental data at low pressures and low temperatures impedes to understand thoroughly the chemistry of DME. Ignition delay times of DME/"air" mixtures with various equivalence ratios of 0.5 - 5.0 were measured in a shock tube at pressure of 3.0 atm over temperatures of 625 - 1.00 K. Aramco Mech 2.0 was selected to reproduce the experimental observation. In general, the kinetic model remains an uncertainty in predicting the reactivity of DME at equivalence ratios below 2.0 but it tends much better at equivalence ratios over 3.0. Unlike the model predictions, the experimental data did not show obvious NTC behavior for the mixtures with equivalence ratios of 0.5 and 1.0. The selected model almost fails to capture the four-stage ignition feature for the mixtures with equivalence of 2.0 even considering the hot spot caused by pre-ignition energy release. © Asia-Pacific Conference on Combustion, ASPACC *** right reserved.

关键词： Ethers

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Simulation of supercritical water gasification of organic wastes with neural network model

Simulation of supercritical water gasification of organic wa...

引用

1.th World Hydrogen Energy Conference 2008, WHEC 2008

作者： Zhang, Qinming Wang, Shuzhong Chen, Chongming Gong, Yanmeng Xu, Donghai State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

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New technology of thermodynamic cycle for waste heat recovery of vehicle gasoline engine

New technology of thermodynamic cycle for waste heat recover...

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2009 Asia-Pacific power and Energy {1. Conference, APPEEC 2009

作者： Zhang, Xin-Xin Zeng, Ke He, Mao-Gang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi China

ISBN: (纸本)9781424424870

In this paper, the exothermic distribution of fuel was studied detailedly through conducting thermal equilibrium experiment when the vehicle gasoline engine was at different working conditions. Considering the characteristic of the exhaust temperature of the vehicle gasoline engine, the Organic Rankine Cycle (ORC) was adopted for the exhaust recovery. The thermodynamic parameter and thermodynamic performance of the main state points in the ORC were theoretically calculated via computer program. The optimal parameter was determined. On this basis, the organic working fluids were selected. In the last part, a new thermodynamic cycle configuration which can be used to recover the heat from exhaust gas, cooling water and lubricant of vehicle gasoline engine was put forward and introduced. © 2009 IEEE.

关键词： Waste heat utilization

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Experimental investigation of heat transfer characteristics of supercritical water in the entrance region of vertical upward tube 7

Experimental investigation of heat transfer characteristics ...

引用

7th International Conference on power {1., ICOPE 201.

作者： Kong, Xiangfei Zhang, Qian Guo, Kaikai Feng, Yuan Lei, Xianliang Li, Huixiong State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

In order to investigate the special heat transfer characteristics of supercritical water in the entrance region, series of experiments have been conducted in 3-m and 6-m long vertical upward tubes with 20.0-mm internal diameter. The experimental parameters cover the pressures from 22.5 to 27 MPa, the mass fluxes from 1.0 to 600 kg/(m2·s), and the heat fluxes from 50 to 500 kW/m2. Enhanced heat transfer (EHT) was observed at the inlet of the test sections which was different from the EHT occurred near the pseudo-critical point. Deteriorated heat transfer (DHT) was also observed at the inlet of the test sections under high q/G conditions. It was found that the inlet bulk fluid enthalpy could affect the occurrence and the degree of DHT at the inlet of the test section. DHT disappeared when the inlet bulk fluid enthalpy exceeded the pseudo-critical enthalpy. Finally, the mechanisms of the EHT and DHT occurred at the inlet of test section were analyzed. © ICOPE 201. - 7th International Conference on power {1., Proceedings. All rights reserved.

关键词： Heat transfer

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LDV measurements of a turbulent channel flow with smooth and rough surfaces

LDV measurements of a turbulent channel flow with smooth and...

引用

1.th Australasian Fluid Mechanics Conference 201., 1.AFMC

作者： Zhang, Y.B. Che, D.F. State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

ISBN: (纸本)9781617829130

Detailed Laser-Doppler Velocimeter (LDV) measurements have been carried out in a turbulent rectangular channel flow with smooth and rough surfaces at different Reynolds numbers. The measured distributions of turbulence statistics across the half channel height at different wall conditions, including mean velocity, turbulence intensity, skewness factor, flatness factor and Reynolds shear stress are all reported and compared. The turbulent statistical quantities on different surfaces exhibit significant differences in both the inner and the outer region, which suggests that the roughness element has an important role on turbulent flow structure extending into the whole layer. There is a significant increase in the streamwise turbulence intensity and a slight increase in the normal turbulence intensity and the Reynolds shear stress over the rough surface. The profiles of the streamwise skewness factor become flatter over the rough walls, while the flatness factor distributions are nearly the same for different surfaces.

关键词： Laser Doppler velocimeters

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Flame front structure and flame speed of turbulent premixed combustion under weak turbulence 10

Flame front structure and flame speed of turbulent premixed ...

引用

1.th Asia-Pacific Conference on Combustion, ASPACC 201.

作者： Yu, Senbin Wang, Jinhua Jin, Wu Nie, Yaohui Zhang, Meng Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi China

Flame front structure of turbulent premixed CH4/air and C3H8/air flames was obtained using OH-PLIF technique, laminar flame properties were calculated and the effect of turbulence intensity on turbulent flame structure and flame speed was analyzed. The results showed that the flame front wrinkled was promoted as the turbulence intensity increases. The correlation between flame speed and turbulence intensity was obtained.

关键词： Turbulence

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Effect of metal oxide on the emission of N2O and NO in fluidized bed temperature range using pyridine as a nitrogenous model fuel

Effect of metal oxide on the emission of N2O and NO in fluid...

引用

20th International Conference on Fluidized Bed Combustion

作者： Wang, X.B. Tan, H.Z. Wang, C.L. ZhaoQ.X. Xu, T.M. Hui, S.E. State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Pyridine has been chosen as the nitrogenous model fuel to research the effect of metal oxide (CaO, MgO and Fe2O3) on the emission of nitrogen oxides in the range of fluidized bed combustion temperature. The experiment was presented in a fixed bed reactor with metal oxide layer, and FT-IR gas analyzer was used to monitor the emission of N2O and NO. When there is no metal oxide loaded, results show that the maximum peak of N2O is at 725°C. Under the rich oxygen condition, NO increases monotonically with temperature increasing, however, under the lean oxygen condition there is a maximum peak of NO at 675°C, NO decreases to a minimum value at 725°C, and then increases slowly. With the addition of metal oxide, the loaded experimental results show that the addition will not change the general trend of nitrogen oxides, but it affects the emission in a certain extent and the effect has relation to temperature, oxygen atmosphere and metal oxide added. Under the lean oxygen condition, both CaO and Fe2O 3 inhibit the formation of N2O and NO in all temperature range;the effect of Fe2O3 on NO is negligible above 900°C;MgO inhibits N2O at temperature higher than 725°C, and inhibits NO only from 625°C to 700°C. Under the rich oxygen condition, CaO and MgO decrease the N2O emission efficiently, but Fe 2O3 can only act at the temperature higher than 700°C. For the NO emission, CaO and MgO inhibit NO just above 775°C, however, Fe2O3 promotes NO greatly especially below 700°C, and it even promotes NO2 to 1.2.65ppm at 625°C. The results and discussion are helpful to demonstrate the effect of metal elements on the emission of nitrogen oxides in fluidized bed combustion.

关键词： Fluidized beds

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Visualization investigation of secondary flow on heat transfer deterioration in horizontal heat tube 22

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201. 22nd International Conference on Nuclear engineering, ICONE 201.

作者： Wu, Chao Li, Hui-Xiong Qian, Zhang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi China

ISBN: (纸本)9780791845905

Mixed convection heat transfer in heated tubes has been studied extensively in the past decades, which is widely used in various industrial fields such as cooling of a nuclear reactor core. The secondary flow, which is induced by buoyancy force, has been found in previous research to have profound influence on the heat transfer difference on circumferential position and occurrence of heat transfer deterioration in horizontal heated channel. Therefore, understanding the secondary flow velocity field has important implications to prevent heat transfer deterioration and ensure the safe operation of nuclear power plants. Numerical methods have been adopted in literature to analyze the complex interaction between secondary flow and heat transfer deterioration. However, to the knowledge of the author, experimental measurement of secondary flow in the radial cross-section of a horizontal tube does not exist.. Copyright © 201. by ASME.

关键词： Numerical methods

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Dynamic performance analysis of different schemes of solar tower power plant

Dynamic performance analysis of different schemes of solar t...

引用

International Conference on power {1. 2021. ICOPE 2021

作者： Wang, Yaqian Chen, Weixiong Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

In this paper, solar power tower stations with different configurations of steam generators are proposed, and a detailed dynamic model of one-dimensional distributed parameters is established and verified. The response characteristics of the two systems under the disturbance of the main controllable variables are calculated, and the results are analyzed and compared. It is concluded that, compared with steam turbines, steam generation systems have significant thermal inertia, and different steam generation system schemes will have a significant impact on the dynamic performance of the system. For a natural circulation-driven system, the energy balance and power output are more sensitive to the hot salt mass flow rate, and mass balance would be adjusted by the feedwater mass flow. For a once-through-driven system, the energy balance is controlled by hot salt mass flow, but the mass balance and power output should be adjusted by the feedwater mass flow. © 2021.The Japan Society of Mechanical Engineers.

关键词： Solar energy

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Flame-front instabilities of outwardly expanding isooctane/ n -butanol blend-air flames at elevated pressures

Flame-front instabilities of outwardly expanding isooctane/ ...

引用

作者： Zhang, Xinyi Tang, Chenglong Yu, Huibin Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an 710049 China

Experiments were conducted in a constant volume bomb filled with isooctane/n-butanol blend-air mixtures over a wide range of n-butanol blending ratios, equivalence ratios, and initial pressures. High-speed schlieren photography was used to measure the critical radius for the onset of flame-front instability. Results show that, for a given n-butanol blending ratio, cellular instabilities appear earlier and the critical Peclet number, which represents the onset of instability, is decreased with the increase of the initial pressure and equivalence ratio. Under fuel-rich conditions, the critical Peclet number increases with the increase of the n-butanol blending ratio. Theoretical calculation of the critical Peclet number was also conducted to interpret the effects of n-butanol on the flame-front instabilities of the blends. Results show that, for rich mixture conditions, with the increase of the n-butanol blending ratio, the overall activation energy of the mixtures is decreased and, thus, the thermal-diffusional instabilities are suppressed. While under fuel-lean conditions, the thermal-diffusional instabilities are favored. As a consequence, with an increasing n-butanol blending ratio, the critical Peclet number is expected to be decreased under fuel-lean conditions and increased under fuel-rich conditions. © 201. American Chemical Society.

关键词： Mixtures

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